mirror of
https://github.com/python/cpython
synced 2024-10-14 11:18:47 +00:00
265 lines
8.1 KiB
Python
265 lines
8.1 KiB
Python
import os
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import subprocess
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import sys
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import sysconfig
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import tempfile
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from contextlib import nullcontext
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from importlib import resources
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from pathlib import Path
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from shutil import copy2
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__all__ = ["version", "bootstrap"]
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_PIP_VERSION = "24.0"
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# Directory of system wheel packages. Some Linux distribution packaging
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# policies recommend against bundling dependencies. For example, Fedora
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# installs wheel packages in the /usr/share/python-wheels/ directory and don't
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# install the ensurepip._bundled package.
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if (_pkg_dir := sysconfig.get_config_var('WHEEL_PKG_DIR')) is not None:
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_WHEEL_PKG_DIR = Path(_pkg_dir).resolve()
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else:
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_WHEEL_PKG_DIR = None
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def _find_wheel_pkg_dir_pip():
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if _WHEEL_PKG_DIR is None:
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# NOTE: The compile-time `WHEEL_PKG_DIR` is unset so there is no place
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# NOTE: for looking up the wheels.
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return None
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dist_matching_wheels = _WHEEL_PKG_DIR.glob('pip-*.whl')
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try:
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last_matching_dist_wheel = sorted(dist_matching_wheels)[-1]
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except IndexError:
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# NOTE: `WHEEL_PKG_DIR` does not contain any wheel files for `pip`.
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return None
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return nullcontext(last_matching_dist_wheel)
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def _get_pip_whl_path_ctx():
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# Prefer pip from the wheel package directory, if present.
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if (alternative_pip_wheel_path := _find_wheel_pkg_dir_pip()) is not None:
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return alternative_pip_wheel_path
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return resources.as_file(
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resources.files('ensurepip')
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/ '_bundled'
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/ f'pip-{_PIP_VERSION}-py3-none-any.whl'
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)
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def _get_pip_version():
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with _get_pip_whl_path_ctx() as bundled_wheel_path:
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wheel_name = bundled_wheel_path.name
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return (
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# Extract '21.2.4' from 'pip-21.2.4-py3-none-any.whl'
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wheel_name.
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removeprefix('pip-').
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partition('-')[0]
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)
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def _run_pip(args, additional_paths=None):
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# Run the bootstrapping in a subprocess to avoid leaking any state that happens
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# after pip has executed. Particularly, this avoids the case when pip holds onto
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# the files in *additional_paths*, preventing us to remove them at the end of the
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# invocation.
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code = f"""
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import runpy
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import sys
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sys.path = {additional_paths or []} + sys.path
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sys.argv[1:] = {args}
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runpy.run_module("pip", run_name="__main__", alter_sys=True)
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"""
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cmd = [
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sys.executable,
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'-W',
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'ignore::DeprecationWarning',
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'-c',
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code,
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]
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if sys.flags.isolated:
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# run code in isolated mode if currently running isolated
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cmd.insert(1, '-I')
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return subprocess.run(cmd, check=True).returncode
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def version():
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"""
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Returns a string specifying the bundled version of pip.
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"""
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return _get_pip_version()
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def _disable_pip_configuration_settings():
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# We deliberately ignore all pip environment variables
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# when invoking pip
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# See http://bugs.python.org/issue19734 for details
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keys_to_remove = [k for k in os.environ if k.startswith("PIP_")]
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for k in keys_to_remove:
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del os.environ[k]
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# We also ignore the settings in the default pip configuration file
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# See http://bugs.python.org/issue20053 for details
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os.environ['PIP_CONFIG_FILE'] = os.devnull
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def bootstrap(*, root=None, upgrade=False, user=False,
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altinstall=False, default_pip=False,
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verbosity=0):
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"""
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Bootstrap pip into the current Python installation (or the given root
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directory).
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Note that calling this function will alter both sys.path and os.environ.
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"""
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# Discard the return value
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_bootstrap(root=root, upgrade=upgrade, user=user,
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altinstall=altinstall, default_pip=default_pip,
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verbosity=verbosity)
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def _bootstrap(*, root=None, upgrade=False, user=False,
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altinstall=False, default_pip=False,
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verbosity=0):
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"""
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Bootstrap pip into the current Python installation (or the given root
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directory). Returns pip command status code.
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Note that calling this function will alter both sys.path and os.environ.
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"""
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if altinstall and default_pip:
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raise ValueError("Cannot use altinstall and default_pip together")
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sys.audit("ensurepip.bootstrap", root)
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_disable_pip_configuration_settings()
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# By default, installing pip installs all of the
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# following scripts (X.Y == running Python version):
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#
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# pip, pipX, pipX.Y
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#
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# pip 1.5+ allows ensurepip to request that some of those be left out
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if altinstall:
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# omit pip, pipX
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os.environ["ENSUREPIP_OPTIONS"] = "altinstall"
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elif not default_pip:
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# omit pip
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os.environ["ENSUREPIP_OPTIONS"] = "install"
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with tempfile.TemporaryDirectory() as tmpdir:
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# Put our bundled wheels into a temporary directory and construct the
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# additional paths that need added to sys.path
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tmpdir_path = Path(tmpdir)
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with _get_pip_whl_path_ctx() as bundled_wheel_path:
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tmp_wheel_path = tmpdir_path / bundled_wheel_path.name
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copy2(bundled_wheel_path, tmp_wheel_path)
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# Construct the arguments to be passed to the pip command
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args = ["install", "--no-cache-dir", "--no-index", "--find-links", tmpdir]
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if root:
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args += ["--root", root]
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if upgrade:
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args += ["--upgrade"]
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if user:
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args += ["--user"]
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if verbosity:
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args += ["-" + "v" * verbosity]
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return _run_pip([*args, "pip"], [os.fsdecode(tmp_wheel_path)])
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def _uninstall_helper(*, verbosity=0):
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"""Helper to support a clean default uninstall process on Windows
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Note that calling this function may alter os.environ.
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"""
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# Nothing to do if pip was never installed, or has been removed
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try:
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import pip
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except ImportError:
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return
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# If the installed pip version doesn't match the available one,
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# leave it alone
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available_version = version()
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if pip.__version__ != available_version:
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print(f"ensurepip will only uninstall a matching version "
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f"({pip.__version__!r} installed, "
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f"{available_version!r} available)",
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file=sys.stderr)
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return
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_disable_pip_configuration_settings()
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# Construct the arguments to be passed to the pip command
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args = ["uninstall", "-y", "--disable-pip-version-check"]
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if verbosity:
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args += ["-" + "v" * verbosity]
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return _run_pip([*args, "pip"])
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def _main(argv=None):
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import argparse
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parser = argparse.ArgumentParser(prog="python -m ensurepip")
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parser.add_argument(
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"--version",
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action="version",
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version="pip {}".format(version()),
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help="Show the version of pip that is bundled with this Python.",
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)
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parser.add_argument(
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"-v", "--verbose",
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action="count",
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default=0,
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dest="verbosity",
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help=("Give more output. Option is additive, and can be used up to 3 "
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"times."),
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)
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parser.add_argument(
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"-U", "--upgrade",
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action="store_true",
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default=False,
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help="Upgrade pip and dependencies, even if already installed.",
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)
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parser.add_argument(
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"--user",
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action="store_true",
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default=False,
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help="Install using the user scheme.",
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)
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parser.add_argument(
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"--root",
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default=None,
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help="Install everything relative to this alternate root directory.",
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)
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parser.add_argument(
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"--altinstall",
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action="store_true",
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default=False,
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help=("Make an alternate install, installing only the X.Y versioned "
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"scripts (Default: pipX, pipX.Y)."),
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)
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parser.add_argument(
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"--default-pip",
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action="store_true",
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default=False,
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help=("Make a default pip install, installing the unqualified pip "
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"in addition to the versioned scripts."),
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)
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args = parser.parse_args(argv)
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return _bootstrap(
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root=args.root,
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upgrade=args.upgrade,
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user=args.user,
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verbosity=args.verbosity,
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altinstall=args.altinstall,
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default_pip=args.default_pip,
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)
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